/Engine/Plugins/Experimental/ScriptableToolsFramework/Source/ScriptableToolsFramework/Public/BaseTools/ScriptableClickDragTool.h
Modifer Buttons Support API
true if the Shift key is currently held down
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="ScriptableTool|Input") bool IsShiftDown() const